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From: Nick Bowler <nbowler AT draconx DOT ca>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DJGPP v2.05: some thoughts
Date: Fri, 5 Jun 2015 18:10:01 +0000 (UTC)
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On Fri, 05 Jun 2015 17:16:19 +0300, Eli Zaretskii (eliz AT gnu DOT org) wrote:
>> From: Martin Str|mberg <ams AT ludd DOT luth DOT se>
>> Date: Fri, 5 Jun 2015 12:29:43 +0000 (UTC)
>> 
>> But, IIRC, C99 (or even perhaps C89) reserved any symbol starting with E.
> 
> Where do you see such language in C99?  I don't see it, and neither do
> I see it in C11.  But maybe I'm missing something, it's not like I've
> read the entire document top to bottom.

Names starting with E followed by a digit or an uppercase letter are
reserved if <errno.h> is included.

C99§7.5p4 Errors <errno.h>:

  Additional macro definitions, beginning with E and a digit or E and
  an uppercase letter, may also be specified by the implementation.

This text was copied unchanged into C11.  I am quite sure it was also
present in C89.